php - update content in 2 browsers AFTER submit -

if have following text updates in 2 browsers normally:

index.php send

function getstatus() {     $.post('update.php', function(data) {         $('div.text_window').html(data);     });     settimeout("getstatus()",1000); }  getstatus(); 

update.php

echo 'some text'; 

but if cancel automatic call function on page load, , assign happen when button clicked (the following code), updates in browser clicked, how make update in other browser well?

$('#send_btn').click(function() {     getstatus(); }); 

it seems issue related availability of jquery, put initial call function in callback

$(document).ready(function() {     getstatus(); }); 

also make sure increase timeout, should 5-10 seconds

if want instant updates , want efficiently, need use pubsub or websockets